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A subfloor's lifespan can range from 30 years to the entire life of the house, which is often between 50 and 100 years. The actual longevity depends on the material and its protection from damage. For example, while OSB may last longer than plywood, it is not the best choice for heavy flooring like ceramic tile. The most critical factor is moisture; a subfloor that avoids water damage, mold, and termites can last for decades. However, prolonged exposure to moisture will cause it to warp, rot, or grow mold, significantly shortening its life.

The toilet flange anchors to the subfloor, usually with wood screws or cement screws, but most of it should sit above floor level at full height. When a flange is flush with the subfloor or below it, it can lead to the creation of leak paths.

The best flooring for radiant heat systems is tile, including porcelain, ceramic, and natural stone. These materials are excellent heat conductors, retain warmth well, and are waterproof, which prevents mold or rot in case of leaks from a hydronic system. Unlike wood, they do not pose a fire safety risk if the heating system overheats. Ceramic tile is a particularly popular choice as it is inexpensive, easy to install, and available in many styles, making it ideal for spaces like bathrooms. Other flooring types that work well with radiant heat include laminate, engineered wood, and vinyl. If you are installing radiant heating over a concrete slab, especially in a basement, it is advisable to install a vapor barrier first to prevent issues with moisture and condensation.

Whether you install flooring before or after kitchen cabinets depends primarily on the type of flooring you are using. For materials like hardwood, tile, and sheet flooring, the best practice is to install the flooring first. This ensures the cabinets are installed at the correct height and on a stable surface. However, you should not install cabinets on top of floating floors, such as laminate or luxury vinyl plank (LVP). These types of flooring need room to expand and contract with temperature and humidity changes. Placing heavy cabinets on top can restrict this movement, potentially causing the floor to buckle and making the cabinets unstable. For floating floors, install the cabinets first and then lay the flooring up to them. Other reasons to consider installing cabinets before the flooring include saving money on materials (since you won't need flooring under the cabinets) and avoiding potential damage to your new floor during cabinet installation. Additionally, installing cabinets directly on the subfloor might prevent voiding your flooring's warranty.